Boxing a fan - Home Energy Pros2015-03-04T00:34:02Zhttp://homeenergypros.lbl.gov/forum/topics/boxing-a-fan?groupUrl=hallofshame&commentId=6069565%3AComment%3A111728&groupId=6069565%3AGroup%3A212&feed=yes&xn_auth=noThat looks like a regular bat…tag:homeenergypros.lbl.gov,2013-03-25:6069565:Comment:1117282013-03-25T13:23:05.532ZSean Lintow Srhttp://homeenergypros.lbl.gov/profile/sls
<p>That looks like a regular bath vent not one of those heat lamp / vent combos.</p>
<p>If you have a heat lamp combo in there that might be a good precaution (check with the manufacturer) but for the rest there is not enough heat generated to cause an issue.</p>
<p>The big issue are recessed lights where you have a regular or CFL bulb pushing out 200+ degree heat inside the fixture itself</p>
<p>I will use a combination of tape, caulk &amp; even foam around the outside of it - I never really…</p>
<p>That looks like a regular bath vent not one of those heat lamp / vent combos.</p>
<p>If you have a heat lamp combo in there that might be a good precaution (check with the manufacturer) but for the rest there is not enough heat generated to cause an issue.</p>
<p>The big issue are recessed lights where you have a regular or CFL bulb pushing out 200+ degree heat inside the fixture itself</p>
<p>I will use a combination of tape, caulk &amp; even foam around the outside of it - I never really touch the inside as that can screw with the UL labeling &amp; besides that they are nearly impossible to get them clean enough for anything to stick long term</p> I tape the joints in the box…tag:homeenergypros.lbl.gov,2013-03-25:6069565:Comment:1114962013-03-25T03:45:08.547ZDavid Meilandhttp://homeenergypros.lbl.gov/profile/DavidMeiland
<p>I tape the joints in the box with foil tape before I install the fan, then go in the attic after the drywall is in and foam the fan/drywall joint after the duct is attached and taped. I don't know how worthwhile it is, since a lot of air leakage tends to be <em>inside</em> the duct, in either/both directions, but if I can seal something, I do it.</p>
<p>I tape the joints in the box with foil tape before I install the fan, then go in the attic after the drywall is in and foam the fan/drywall joint after the duct is attached and taped. I don't know how worthwhile it is, since a lot of air leakage tends to be <em>inside</em> the duct, in either/both directions, but if I can seal something, I do it.</p> Ted, I was taught to box with…tag:homeenergypros.lbl.gov,2013-03-25:6069565:Comment:1116212013-03-25T01:57:11.193ZAndrew Aliferishttp://homeenergypros.lbl.gov/profile/AndrewAliferis
<p>Ted, I was taught to box with 5/8" fire-rated drywall with a 3" clearance from any heat source. Once the box is fit into place it is foamed around the base. I tape my seams inside and out with <span>approved foil tape. Some of the programs feel drywall is a mold risk, so they require boxing in metal stove pipe with a cap.</span></p>
<p>Ted, I was taught to box with 5/8" fire-rated drywall with a 3" clearance from any heat source. Once the box is fit into place it is foamed around the base. I tape my seams inside and out with <span>approved foil tape. Some of the programs feel drywall is a mold risk, so they require boxing in metal stove pipe with a cap.</span></p> I'm with David in that questi…tag:homeenergypros.lbl.gov,2013-03-25:6069565:Comment:1117122013-03-25T01:45:46.480Ztedkiddhttp://homeenergypros.lbl.gov/profile/tedkidd
I'm with David in that question. Not sure it's a fire risk, but it is a leaky component adjacent to a high humidity source. Does not look air sealed.<br />
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Addressing this as you would a can light before adding cellulose is how I've addressed this (box, 2 part all seams)<br />
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I think some may simply seal penetrations and seams in the box, which might be acceptable and does not appear to have been done either.<br />
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Wonder what local requirements are or how others handle this.
I'm with David in that question. Not sure it's a fire risk, but it is a leaky component adjacent to a high humidity source. Does not look air sealed.<br />
<br />
Addressing this as you would a can light before adding cellulose is how I've addressed this (box, 2 part all seams)<br />
<br />
I think some may simply seal penetrations and seams in the box, which might be acceptable and does not appear to have been done either.<br />
<br />
Wonder what local requirements are or how others handle this. If it's just a bath fan, what…tag:homeenergypros.lbl.gov,2013-03-25:6069565:Comment:1114912013-03-25T01:10:42.161ZDavid Meilandhttp://homeenergypros.lbl.gov/profile/DavidMeiland
<p>If it's just a bath fan, what's the fire risk? Do the manufacturer's instructions call for clearance to combustibles?</p>
<p>If it's just a bath fan, what's the fire risk? Do the manufacturer's instructions call for clearance to combustibles?</p>